Shatner is great charging around everywhere with Kirk in a bad mood.
I think Shatner is at his best when Kirk is in a bad or authoritative mood. Not only in this episode but also in Immunity Syndrome
when no one can explain what is happening such as the following:
"No speculation, no information, nothing? I've asked you three times for information on that thing and you've been unable to supply it. Insufficient data is not sufficient, Mr. Spock! You're the science officer. You're supposed to have sufficient data all the time. "
But back to Tribbles as I already said I do love that Kirk/Scotty scene.